ETC RX4756

RX4756
868.35 MHz
•
•
•
•
•
ASH Receiver
Ideal for 868.35 MHz, 3 V data Receivers in Europe
High-Sensitivity Passive Design with No RF Oscillation
Use with HX4007 for 19.2 kbps Data Rate
Simple to Apply with External Parts Count
Rugged, Surface-Mount Package with 130 mm2 Footprint
This amplifier-sequenced hybrid (ASH) receiver is based on several leading-edge
SM-10 Case
technologies that allow outstanding performance in a small and simple-to-apply
module. Two surface-accoustic-wave (SAW) devices are employed. Front-end filtering by a low-loss coupled-resonator SAW filter provides excellent selectivity. Typical sensitivity better than -80 dBm is achieved with no RF oscillating or regenerative circuits. This results in virtually no RF spurious
emissions. A low-loss SAW delay line provides the time delay necessary to sequence the two RF amplifiers. Time sequencing of the RF
gain eliminates the need for frequency conversion prior to AM detection. This receiver is designed to operate from 3 V lithium battery
with typically 2.5 mA current. For system design flexibility, the baseband output is accessible, and the comparator threshold can be
changed externally between two settings. Typical applications include unlicensed wireless remote-controls and digital data links operating in Europe under the European Telecommunication Standard (ETSI) 300-220-1.
Electrical Characteristics
Characteristic
Operating Radio Frequency
Sym
Notes
fC
2,3
868.35 Nominal
4,5
Pulse Modulation (OOK)
Received Carrier Modulation Type
RF Band
Minimum
Sensitivity
Typical
-10
6
Channel Width
Half-Frequency Spurious
Sample Duration
Sample Repetition Rate
Data Rate
Default (Terminal 5 LOW)
Digital Output
Power Supply
Output HIGH Voltage
VOH
Output LOW Voltage
VOL
11
kHz
56
kbps
25
10
pF
VCC -0.2
VCC
V
0.0
0.2
tR
3
Fall Time
tF
3
VCC
Current at 25C and 3.0 V
ICC
TA
1
1
2.7
ms
3.0
3.5
VDC
4
5
mA
+85
°C
-40
RFM RX4756
Lid Symbolization (in addition to Lot and/or Date Codes)
Phone: (972) 233-2903
mV
0
Rise Time
Operating Voltage
ns
625
CMOS Load Capacitance
Operating Ambient Temperature
RF Monolithics, Inc.
700
10
Override (Terminal 5 LOW)
dB
15
9
Comparator Threshold
W
80
8
dBm
kHz
50 Nominal
7
fC ± 1 MHz
Sequencing (Sampling)
fC±200
ZIN
Input Impedance
Units
MHz
-71
Operating Signal Strength
Interference Rejection
Maximum
Fax: (972) 387-8148
©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc
E-mail: [email protected]
http://www.rfm.com
RX4756-121198
Page 1 of 4
The RX Series SMT Hybrid ASH Receivers
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Unless noted otherwise, specifications apply over the entire specified operating temperature and voltage ranges.
2. One or more of the following United States patents apply: 4,454,488; 4,616,197; 4,749,964; 4,902,925. Other patents are pending.
3. Typically, equipment utilizing this device requires emissions testing and government approval, which is the responsibility of the
equipment manufacturer.
4. The design, manufacturing process, and specifications of this device are subject to change without notice.
5. A variety of on-off-keyed (OOK) pulse modulation schemes are possible since digital decoding is an external function (not included
in the ASH receiver).
6. These parameters apply over the absolute minimum operating passband which is referenced to fC.
7. With interfering signal matched to the receiver modulation and code. See “Typical Modulated Interference Rejection” for a more
detailed view.
8. Sample repetition rates greater than 1 MHz are available in custom versions. Contact RFM for details.
9. Baseband data rates are available to 20 kbps, respectively, in custom versions. Contact RFM for details. See HX/RX Designer’s
Guide for details on data rate limits.
10. The default comparator threshold (with terminal 5 not connected) is optimized for low duty-cycle, or “bursty” data and eliminates
noise output when there is no RF signal. The override threshold (with terminal 5 connected to ground) is optimized for continuous
data.
11. The ASH receiver is designed to drive a single CMOS load.
12. For ESD protection
Absolute Maximum Ratings
Rating
Value
Units
+10
dBm
-0.3 to +4.0
VDC
Incident RF Power
Power Supply Voltage (VCC to Ground) (Observe ESD Precautions)
ESD (100 pF, 1.5 kΩ)
Terminals 2, 3, or 7 to Ground
±2000
All Other Terminals to Ground
±300
-40 to +100
Case Temperature
V
°C
Block Diagram and Electrical Connections
50 ohm Antenna
Note 12
10
9
8
7
RF Input
Gnd
Gnd
Data Output
6
Voltage
Reference
1 uF
Top View
Pulse
Generator
RF
Amp.
SAW
Delay
Line
RF
Amp.
AM
Detector
LPF
SAW BPF
Comparator
Baseband
Output
2
Vcc
1
+3V
Comparator
Input
3
Gnd
4
Threshold
Override
5
10 uF
0.1 to 10 uF
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc.
E-mail: [email protected]
http://www.rfm.com
RX4756-121198
Page 2 of 4
The RX Series SMT Hybrid ASH Receivers
Demonstration Circuit
1
16
2
15
14
Top View
1 Vcc
+3V
Lithium
CR2032
RF In 10
10 uF
Gnd 9
3
3 Comp In
Gnd 8
4
Data Out 7
5
Vref 6
6
11
7
10
4 Gnd
5 Thres
Override
1 uF
MC145028 Decoder
10 uF
2 BB Out
13
1 mA @ 3 VDC
RS 273-065A or equiv
12
Piezo
Alarm
33 K
0.1 uF
0.1 uF
OPEN: Default 25mV
CLOSED: Override 0V
8
620 K
9
Typical Modulated Interference Rejection (433.92 MHz RX1000 Shown)
This plot is for an interfacing signal modulated with the receiver’s modulation and code. Continuous wave (CW) or signals with other
modulation or codes typically result in significantly better rejection performance.
Spurious Rejection Relative to Passband Sensitivity (dB)
0
0
10
10
20
20
30
30
40
40
50
50
60
60
70
70
80
80
90
90
100
100
110
110
120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640
216.96
Half Freq. Spurious
Response
RF Monolithics, Inc.
Phone: (972) 233-2903
433.92
Operating Freq.
Fax: (972) 387-8148
©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc.
Frequency (MHz)
E-mail: [email protected]
http://www.rfm.com
RX4756-121198
Page 3 of 4
The RX Series SMT Hybrid ASH Receivers
Case Design
0.370
(9.40)
0.241
(6.12)
0.10
(2.54)
0.050
(1.27)
10 Places
0.070
(1.78)
4 Places
RFM
Rxxxxx
0.540
(13.72)
0.065
(1.65)
10 Places
0.100
(2.54)
4 Places
Typical Antennas
A
B
C
D
Ground Plane
50 Ω
Enameled Wire, AWG = G
Inner Dia = E
No. Turns = F
Frequency
Dimensions
Units
303.825
A
B
C
418.0
433.92
916.5
Inches
5.35
3.9
3.55
1.58
Millimeters
135.89
99.06
90.17
40.13
Inches
1.0
0.6
0.6
0.4
Millimeters
25.4
15.24
15.24
10.16
Inches
0.25
0.6
0.55
0.18
Millimeters
6.35
15.24
13.97
4.4
Inches
3.7
2.7
2.4
1.0
Millimeters
93.98
68.58
60.96
25.4
Inches
0.375
0.1
0.1
0.1
Millimeters
9.53
2.54
2.54
2.54
F
Number of
Turns
4T
16T
15T
7T
G
AWG
#20
#22
#22
#24
D
E
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc.
E-mail: [email protected]
http://www.rfm.com
RX4756-121198
Page 4 of 4